3	1
	4	5
	1			6	2
					1	4
	5	4
		6	7			3
					8	6
					3	2

Difficulty: Very easy (0)

			2
1
4				8		6
	6	2		3		5
	4		6		2	7
	2		1				5
							3
				4

Difficulty: Very easy (0)

						5
			5	6		7
			4			2
						6	1
2	3
	1			2
	5		7	1
	8

Difficulty: Easy (0)

	4			2		1
					7		3
		2		7			1
	5
						7
5			2		1
6		8
	1		4			6

Difficulty: Very easy (0)